Compute or Simplify as Much as Possible $\mathrm { r } - (- { \mathrm { r } } - \mathrm { s } )$

Multiple Choice

Compute or simplify as much as possible.
- $\mathrm { r } - (- { \mathrm { r } } - \mathrm { s } )$

A) $2 r + 2 s$
B) $2 r - s$
C) $r - 2 s$
D) $2 r + s$